This is the Free Pascal compiler for Nintendo DS. You can find a binary distribution for Windows on freepascal's server.
Please, read the readme.txt file in the package in order to install the compiler.

Screenshots :
To do... =)

Current stable release (2.2.4a) - (11.5 MB)

Sources are available on Free Pascal SVN repository 

More infos :
FPC4NDS wiki page
FPC 4 GBA Initiative site